Double-Duty Exercises

Cross "no free time" off your list of workout excuses.

We've found an exercise plan that transforms all of your trouble zones, lickety-split. Created by Hollywood trainer Michael George, who counts Reese Witherspoon, Julianne Moore, and Meg Ryan among his high-profile clients, this total body sculpting plan hits every problem area in 15 minutes flat. The secret: double-duty exercises.

"You do twice the work in half the time, because every move targets several major muscle groups at once," explains George, author of Body Express Makeover (Fireside, 2005). Complete this routine three times a week, plus at least 30 minutes of cardio on most days, and you'll fast-track your way to a sleeker, more defined body in just six weeks!

Repeat row/kickback combo for all reps, remaining in lunge throughout.

Switch legs and repeat.

Beginners: 12-15 repsIntermediate/Advanced: 16-18 reps

7. Standing Side Leg/Arm Raise

Fitness Focus: Core, Outer Thighs, Hips, Shoulders

Stand behind a chair or low wall with knees slightly bent. (To increase difficulty, tie a resistance band around ankles; not shown.)

Grasp back of chair or wall with right hand, holding dumbbell in your left hand with palm in.

Bend right knee slightly and lift left leg out to side as high as you can while keeping hips facing forward.

At the same time, lift left arm to side to shoulder level, keeping elbow slightly bent.

Lower arm and leg and return to start.

Do all reps; switch sides and repeat.

Beginners: 12-15 repsIntermediate/Advanced: 16-18 reps

8. Ball Crunch with Chest Press

Fitness Focus: Chest, Abs, Lower Back, Quads

Lie with your middle back on a stability ball, elbows bent with weights just above chest, palms forward.

Lift your head and tuck your chin, tightening your abs.

Lift shoulders off the ball, crunching up while extending arms, pushing weights up and together (not shown).

Hold for 1 count; lower and return to starting position.

Do all reps; rest for 20 seconds and repeat.

Beginners: 12-15 repsIntermediate/Advanced: 16-18 reps

Your 10-Minute Cardio Plan

Mix these 10-minute fat-blasting aerobic intervals into your strength routine: You'll burn about 600 calories and still be finished in 45 minutes. Do one cardio circuit after every two to three strength moves. On days when you're really pressed for time, even just one of these cardio bursts can burn at least 100 calories. Or, on days when you're not doing the strength moves, do all three in a row for an intensive cardio routine.

Calisthenics Circuit

Minutes 0:00-1:00 March briskly in place.Minutes 1:00-1:30 Run in place, lifting your knees as high as you can.Minutes 1:30-2:30 Run in place, bringing heels toward butt.Minutes 2:30-3:00 Run in place, lifting knees.Minutes 3:00-4:00 March in place to recover.Minutes 4:00-5:00 Jumping jacks: Bring arms fully overhead.Minutes 5:00-5:30 March in place to recover.Minutes 5:30-6:30 Leg scissors. Jump legs forward and back, bringing opposite hand and foot forward.Minutes 6:30-7:00 March in place to recover.Minutes 7:00-8:00 Skater touch: Cross right leg behind left, touching left hand to floor in front of you. Staying low, repeat on opposite side. Continue, switching sides.Minutes 8:00-9:00 Side touch: Shuffle from right to left side, touching outside hand to floor and staying in a half-squat throughout.Minutes 9:00-10:00 March in place to recover.

Stair Climb

Minutes 0:00-1:00 March briskly in place or on the treadmill (3.5 mph, incline 0%).Minutes 1:00-1:30 Jog up a long set of stairs (option: Increase treadmill to 8-12% incline).Minutes 1:30-2:30 Turn around and walk down stairs (on treadmill, lower incline to 0%).Minutes 2:30-9:00 Repeat minutes 1:00-2:30, alternating stairs and recovery sprint four and a half times.Minutes 9:00-10:00 Walk to recover.